Modern wheel designs are more susceptible to damage from clamping during balancing. An adjustable flange plate provides protection by applying clamping pressure from the balancer to the stud holes in a wheel, protecting its finished outer surface.
For example, using flange plates is the best mounting method for plastic clad wheels as the plastic surface is likely to crack if clamped on a balancer.
Hunter Engineering offers an optional adjustable flange plate for their balancers, that uses a single plate to handle three to eight-lug wheels, providing quick setup for maximum coverage and universal fit.